DIFF Subgroup
C01B 33/158 Purification; Drying; Dehydrating
Introduced: January 1980
Full Title
Full titles differ between systems:
IPC:
Silicon; Compounds thereof > Silicon oxides; Hydrates thereof > Silica; Hydrates thereof, e.g. lepidoic silicic acid > Colloidal silica, e.g. dispersions, gels, sols > After-treatment of gels > Purification; Drying; Dehydrating
CPC:
Silicon; Compounds thereof ( C01B21/00, C01B23/00 take precedence; persilicates C01B15/14; carbides C01B32/956) > Silicon oxides; Hydrates thereof > Silica; Hydrates thereof, e.g. lepidoic silicic acid > Colloidal silica, e.g. dispersions, gels, sols > After-treatment of gels > Purification; Drying; Dehydrating
Of 1 combined children, 0 exist in both systems.
1 codes are CPC-only extensions.
Child Classifications
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